Gyratory apparatus



Oct. 7, 1941. s D, RoBlNs GYRATORY APPARATUS Filed April ll, 1940 2 Sheets-Sheet l INVENTOR MMI/EL H05/N5 BY f 7%@ ATToRw-Y s. D. -RoBlNs 2,258,217

GYRATORY APPARATUS Oct. 7, 1941.

Filed April l1, 1940 2 Sheets-Sheet 2 13 F IG. 6.

FIG. 5.

gab/K ze SMS2 INVENTOR ATTO R N EY Patented Oct. 7, 1941 Samuel D. Ro

New

bins, Yo N. Y., assign te Robins Conveying Beit 65m u pany, New York,

N. lY., a corporation of New York Application April 1l, 1940, Serial No. 329,091

(Cl. 'i4-6l) f V30 Claims.

The invention relates to means for imparting gyratory motion to a freely suspended body or to a body otherwise supported for movement in a gyratory path. More particularly, it relates to apparatus for imparting motion of this character to conveyers and to screens for classifying or siz- Y inggranular or comminuted materials and the In myrte-pending application Serial Number ,077 filed January 18, 1937, issued May 14, 1940 as Patent Number 2,200,724, I have disclosed j improved apparatus lfor imparting gyratory motion to a freely or resiliently suspended body and particularly for causing such a suspended body to be propelled through a non-circular orbit.

Y 'I'he present invention relates to apparatus of this general character in which means are prot vided for positively `determining or controlling the extent of movement of the body along at least one axis of its non-circular orbit. Toward this prior application, above mentioned, with additional cooperating means for positively controlling displacement of the suspended body in the general direction of the major axis of its orbit land it may include means for otherwise control- A "endthe invention, in its preferred form, involves Y the use of apparatus of the type disclosed in myto such aV screen a non-circular substantially elliptical gyratory motion,.the combined advantages of al reciprocatory and circular motion are obtained. A very rapid feeding action is obtained with the screen arranged horizontally, or

nearly so, and the gyratory motion tends to l-otate the granules or lumps so that a very eective separation of the different sizes is attained. For best results, the motion of the entire screen should be uniform; that is, al1 portions of the screen should describe the same orbit.

As described in my co-pending application above referred to, a smooth, uniform, non-circular or elliptical gyratory motion of a screen or other body can be produced by freely or resiliently supporting the body for movement in all directions and imparting to it the e'ectof a resultant force which is constantly changing in direction and magnitude applied at its center of gravity. .If the resultant forces applied at the form of an ellipse. A resultant force of constantly changing direction and magnitude can be produced by applying to the screen a rotating force of constant magnitude and concurrently applying to the screen a second force designed to work against and partially counteract or modify the rotating force as the latter passes through its cycle. This may be accomplished in any one of a number of different ways. The constant rotating force may most easily be created by the rotation of a mass about a point removed from its center, the mass being carried in a suitable way by the body to be acted upon. 'Ihe modifying force may be created by arranging a non-rotating inertia mass in a manner to increase the inertia of the body, or its resistance to movement, to a tions than in others. Alternatively, the modifying force may be applied by another rotating mass of appropriate magnitude and in suitable relation to the first rotating mass to provide the desired effective resultant force at the center of gravity of the body.

In my, preferred arrangement, the gyratory motion is brought about by the use of rotating masses associated with the bodies to be acted upon. 'Illese masses are arranged for rotation in opposite directions and they are of unequal magnitude or are otherwise arranged so as to be capable of establishing centrifugal forces of unequal magnitude. The masses may be arranged to apply their centrifugal forces to `the screen or other body directly at the center of gravity of the latter or -at points removed from such center but so selected that no up about the center should be rotated at of gravity. The two masses the same speed to insure a desired synchronous relationship such that the centrifugal forces at certain instants are created along the same or parallel lines so as to be directly combined in their effects at a chosen angle to the horizontal. For example, the screening action produced by a substantially elliptical motion, the maior axis of which is disposed at an angle of about 40 to the horizontal, is very effective. Such a screening action may be obtained by the use ofv a pair of counter-rotating center of gravity of the screen be indicated as vectors radiating from the center of gravity, a smooth curve connecting the ends of the vectors will indicate the path or orbit described by every point on the screen, and this should be in the forces if the forces are coincident and combined alongthe desired 40 line and are coincident and opposed along a line normal to said 40 line.

It will be understood that if the centrifugal forces are applied to the body directly at its center of gravity, no turning moment will be created and the form of the gyratory path of the body will be determined by the relative magnitude of the forces, their sums determining the major axis and their differences the minor axis of the elliptical orbit. However, in order to avoid interference with the material carried by the screen or conveyor, the rotating forces may be greater extent in certain direc-V turning moment will be 'setA applied at points removed from the center of gravity of the screen but in such a way that a uniform motion will be imparted to all portions rection and amount. Throughout the contin,`

ual change in direction of the two forces, their 'relationship is such that no substantial turning moment is created about the center of gravity of the screen. Reference to the screen" in this connection is intended to include such associated structure as is mounted forgyratory movement therewith or may be taken to refer to some other form ofgyratory body.

While for any given constant conditions of operation, revolving masses arranged in the manner described produce substantially uniform movement of the screen in a non-circular orbit approximating an ellipse in form, changing conditions of load. character of material, proportion of fine tocoarse material, and so on, may cause undesirable variation in the form or extent of this orbit. Accordingly, it is an object of the present invention to provide apparatus of the character described comprising in combination with the aforesaid means for producing elliptical gyration, means for positively controlling the displacement of the gyrating body in the general direction of the major axis of its elliptical motion.

A further object is to provide apparatus for producing elliptical motion of a screen such that the major axis of the elliptical motion will lie at a predetermined angle to the horizontal. and

which comprises means for positively controlling the displacement of the screen in that predetermined direction.

A rnore speciiic object is to provide apparatus for imparting bodily elliptical motion to a screen frame in combination withf-means secured to a fixed support for controlling the displacement of the frame in the general direction of the major axis of such elliptical motion.

Another object is to provide means for producing and positively controlling elliptical motion of a freely or resiliently suspended body in thevdirection of both the major and minor axes of such elliptical motion.

One of the leading advantages of the means and apparatus disclosed herein is that of insuring complete smoothness of operation under all conditions of loading and operation of a screen gyrating bodily in an elliptical orbit under the impetus of unbalanced gyrating masses. Other objects and advantages of my invention will appear as the description proceeds.

In the drawings, Fig. 1 is a side elevational View of a screen embodying the invention; and Fig. 2 is afront elevational view of the screen.

Figs. 3-9 inclusive are schematic views indicating a number of different arrangements for imparting gyratory motion to a resilently suspended screen frame in combination with means for controlling the displacement of the iframe in a selected direction or directions. Figs. 3 and 4 represent side elevational and plan views respectivelxrof an embodiment of the invention in which the centers of rotation of the propelling masses coincide with the center of gravity voi' the frame and in which the positive controlling means is arranged to control displacement of the frame in the general direction of the major axis of its elliptical orbit.

Figs. 5 and 6 represent side elevational and plan views respectively of an embodiment in which one of the propelling masses is arranged for rotation about an axis passing through the center of gravity of the frame and in which two counter-rotating masses have their centers of rotation symmetrically arranged with respect to the center of gravity. In this embodiment, means are provided for positively controllingthe displacement of the frame in the general directions of both the major and minor axes of the elliptical orbit.

Figs. 'l and 8 represent side elevational and plan views respectively of another embodiment of the invention in which a single rotating mass is employed in conjunction with inertia members arranged in such a manner as to oppose movement of the frame in the generaldirection of the minor axis of the elliptical orbit described by the frame and in which means secured to a fixed support are provided for positively controlling displacement of the frame in the general direction of the major axis of that elliptical orbit.

Fig. 9 illustrates an embodiment which is the same as that shown in Figs. 1 and 2 except or the relative size and arrangement or the rotating masses.

Referring to Figs. l and 2, there is shown a screen structure including a frame III adapted to receive a gyratory motion of the improved character with positive control'of displacement in a predetermined direction. This frame may be of any suitable construction and by way of example may be provided with a pair of screening surfaces II and I2 extending horizontally across the same throughout the length of the frame. The particular embodiment illustrated is one whichis known as the double deck type, but it should be understood that the invention vis equally applicable to single deck or triple deck screens as Well as to other desired forms of screens or conveying mechanism. The screen elements II and I2 may be of any suitable construction and may be secured to the frame I0 by spring-tensioned bolts or in any other convenient manner. f

Adjacent each corner of the frame there is provided a supporting spring I3l which at its upper end is secured to a suitable fixed support (not shown) and at its lower end engagesv a bracket I4 secured to the side of the frame. The springs I3 may have trunnioned engagements with the brackets I4 to provide ample freedom of movement of the frame. The springs I3 are preferably quite soft and readily extensible so that the natural period of vibration of the springs and supported mass will be low. This will prevent any danger of undue interference with the vibration of the screen at the desired speed of Voperation and in addition oers good insulation duced by the bar v25.

The devices for imparting a gyrato'ry motion to the screen frame are associated with the frame in any convenient manner for which purpose there may conveniently be provided a pair of brackets I attached to the side wallsof the frame. The brackets I5 are provided with bearings-l5 for a pair of shafts Il vand Il which extend across the top of the frame Il. Keyed to the ends of the shafts I'l and I l are intermeshing gears I5 and 2l. A pulley 2| keyed to the opposite end of the shaft il is connected by a belt 22 to a drive pulley 25 carried by the shaft of a motor 2l, or is otherwise connected with a suitable source of power.`

A bar 25 of appropriately chosen mass extends longitudinally of the shaft il. preferably for substantially the full distance between the bearings Il. Thisbar maybesecured to the shaftin any suitable way. Similarly a bar 25 is secured longitudinally of the shaft I5. The bars 25 and 26 are of dinerent sizes in cross section so as to provide masses of unequal magnitude adapted to be revolved respectively about the axes of the shafts Il and I 5. The gearing 15, is such that the two shafts rotate at the same angular speed but -in opposite directions. As they are rotated, centrifugal forces will be developed which for each mass at any given instant will be along a radial line connecting the center of the mass with the axis'of rotation. Thus, if B designates the axis of the shaft Il and E the center of mass of the bar 26, the centrifugal force will always be radially-outward along the line BE, the direction of which is constantly changing. Similarly if C designates the axis of the shaft Il and G the center of mass of the bar 25, an outward radial force will be created along the line CG in the course of rotation of the shaft Il. The axes of the shafts Il and Il lie in a plane which passes through the center of gravity of the frame lll together with the superposed operating mechanism all of which constitutes what maybe designated the live frame. In the construction shown, the center of gravity of the live frame is assumed to be located at the point designated at A in Fig. 1. For best results, the axes B and C should be so arranged that the line ABC will be 'at an angle of about 40 to the horizontal. When the masses and 25 are rotating, and at the instant they reach the position shown in Figs. 1 and 2, the radial force exerted by the two masses is directed outwardly along the line ,ABC in the through the center of gravity A. When the shafts are rotating, and at the instant that the masses 25 and 25 reach a position removed 180 from that shownin Figs. 1 and 2, the resultant of the radial forces acts along the line CBA toward the center of gravity of the gyrating body.

At both of the'instants referred to, the radial forces created by the two rotating masses act in the same direction. At Y intermediate points these radial forces act partly or wholly in opposition to one another. In order that no turning moment shall be created about the center of gravity of the suspended body. the relationship between the two masses 25, 26 should be such that the distance from A to B is to the distance from A to C as the centrifugal force produced by the bar 25 is tothe centrifugal force pro- In other words. these centriiugal forces should be inversely proportional to the distances-ofthe centers of rotation of the masses producing -them from the center of gravity of the suspended frame structure. In the 40 plane passing construction shown. the centers of the two masses are equi-distant from their axes of rotation, i. e., BE equals CG. Accordingly, the masses themselves are inversely proportional to the distances of their axes of rotation from the center of gravity of the frame. In lieu of selecting masses of different magnitude, the distance BE might be made greater than the distance CG as shown in Fig. 9 so that the centrifugal forces created by masses 25' of equal magnitude rotating at the same speed would be inversely proportional to the distances from the points of application of these forces to the center of gravity of the frame. It will thus be seen that for all positions of the masses 25 and 25, or the masses 25', intermediate that shown in Fig. 1 or Fig. 9 and that which they occupy after rotation through 180, the centrifugal forces -will be balanced with respect to the center of gravity. In the two positions speciiically referred to. the resultant force passes through the center of gravity; hence at no time is there any substantial turning moment applied to the frame.

When the masses 25 and 28 are rotating. and at the instant they reach an angular displacement of from the position shown in Fig. 1, the forces are `directly opposed to one another. As has been seen, vby reason of the relationship between the masses and their distances from the center of gravity, the turning moment created by one of the masses balances the turning moment created by the other. 'I'hese forces are unbalanced, however, with respect to their eiect upon bodily displacement of the frame in a direction normal to the plane containing the axes of the shafts l1 and i8. A resultant forcetending to cause bodily displacement of the frame along this normal line in the direction of the force created by the mass 26 is created, and the magnitude of this resultant force is equal to the difference between the centrifugal forces created by masses 25 and 26.

termediate positions of the and 26, it will be found that the turning moments about the lcenter of gravity of the body are balancedr and `if the resultants of the forces cre- Similarly for al1 inrotating masses 25 l0 is supported for relatively free movement in all directions, it will be apparent that the resultant, which is constantly changing in both direction and magnitude, will impart a corre'- sponding change in the movement of the frame. With appropriately chosen weights it is readily possible with this arrangement to produce an ellipse having a 5 to l ratio between the major and minor axes without incurring dangerously high tooth velocities for the necting the shafts. Thus the axis of shaft I8 may be two units removed from the center of gravity of the frameV while the axis of shaft il may be three units removed from the center. Masses 26 and 25 secured to the shafts i8 and Il respectively will then bear to each `other the ratio of 3 to 2.

vSecured to the end of the shaft I8 is an eccentric cam 2l. The cam 21 engages a strap 28 secured to a rod 29n which at its other end is pivotally mounted at 30 to a fixed support 3l. The support 3| may be secured to the oor or it may constitute a Portion of a stationary base frame.

After a frame constructed in accordance with invention has been set into motion at the gears I9, .20 condesired speed, it will beiound to follow a smooth substantially elliptical gyratory path whose major axis is in the direction ABC. Moreover, by

reason of the provision of the eccentric controll mechanismy secured to a fixed support, the extent of translation ofthe frame in the general direction of this major axis'is positively controlled and will not vary under changing conditions of speed, load, character of material,

-percentage of throughs in the feed, .size and will have little or no effect upon the tension o1" the belt. Movement of the screen along the minor axis is so small that it is readily permitted by the belt and vdoes inot`appreciably interfere with the drive.

A more uniform action of the screen is insured if the trunnion brackets |4 for the supporting springs are arranged in a plane passing through or close to the center of gravity of the frame.

In a typical unit constructed in accordance with the invention, the screen frame together with the gyrating mechanism mounted thereon may weigh say 1 ton. The masses 25 and. 26 may suitably be about 75 pounds and 100 pounds respectively. When they are rotated at a speed of about 1100 R. P. M., an elliptical motion having a major axis slightly under half an inch and a minor axis of about 115 inch will be produced. The masses may be rotated in either direction, but the most efficient screening will take place if the rotation is such, as to produce a motion of the screen frame counter to the direction of movement of the material along its surface. This means that if the material advances from left to right in Fig. 1, the mass 25 should be revolved clockwise and the mass 26 should be revolved counter-clockwise. The rate of advance of the material along the screen will be substantially the same-on the order of about 4 feet in 5 seconds-whether the masses are rotated as specified or in the opposite directions. The separation of the material is markedly more efficient, however, when the motion of the screen is as stated.

In Figs. 3-8 inclusive there are illustrated schematically a number of modified constructions. In. each of these modifications the construction may be assumed to be substantially the same as described with reference to Figs. 1-2 as far as concerns the frame I0, supporting springs |3, rod 29, and fixed support 3|; and throughout these views the same reference numerals have been employed for the elements enumerated.

In each of the modifications the arrangement is such as to produce an elliptical motion of the type described, with its major axis inclined at an angle of about 40 to the horizontal. The

ratio of major to minor axis may, however, be`

varied in each case quirements.

In Figs. 3 andl 4 there is shown schematically an arrangement in which the unequal masses 40 and 4| are arranged for rotation about an axis extending through the center of gravity of the frame. These masses may, if desired, both extend longitudinally of their concentric shafts 42 and 43. However, this would necessitate the lto suit the particular retate within it. Accordingly I prefer to mount I one of the masses, preferably the smaller mass 4|, at each end of the shaft 42 and the larger mass 40 either at the ends of, or distributed along, the hollow shaft 43 surrounding shaft 42. Any suitable gearing vmay be employed to connect the shafts 42 and 43 for synchronous rotation in opposite directions; for example, bevel gears 44 and 45 of equal pitch diameter, secured to the ends of the shafts 42 and 43 respectively (Fig. 4) may be arranged to mesh with a bevel pinion 46 rotatable in a suitable bracket 41 secured to the side of the frame I0. vEither shaft may be actuatedthrough a belt `and pulley drive of the type shown in Figs. 1 and 2. Inasmuch as the axis of rotation of both of the masses 40 and 4| passes through the center of gravity of the frame, there .will be no turning moment produced. With proper selection of masses, elliptical orbits of different major to minor axis ratios may be obtained.

Figs. 5 and 6 illustrate another modification in which one mass 5| is mounted upon a shaft 52 carried by the frame at its center of gravity. In lieu of a single second mass of different magnitude from the mass 5| a pair of equal masses 53 and 54 are provided which have a combined mass different from and preferably greater than the mass 5|. All three of the masses are rotated at the same speed by gearing 55, the masses 53 and 54 being driven in the same direction and mass 52 in the opposite direction. 'I'he axes about which the masses 53 and 54 are revolved are arranged at equal distances from the center of gravity and on opposite sides thereof'. Accordingly, they provide equal and opposite moments about the center of gravity and there is no tendency to rotate the frame. As in the embodiments previously described, the masses may be of any chosen magnitude to provide the desired form of elliptical orbit. They may be disposed either along the shafts or at the ends thereof depending upon the need for conserving vertical space. When the masses in this type of construction extend along the shafts of a multi-deck screen, Jit is necessary to increase somewhat the spacing between the decks toallow for the free passage of the material along th lower deck or decks without interference with the revolving masses.

A special feature of the modification shown in Figs. 5 and 6 resides in the use of two pair of eccentric rods 29 and 29 in place of the single pair of rods of the embodiments previously described. These rods are secured to separate eccentric cams keyed to the shaft 52. As illustrated, the first pair of eccentric rods 29 extends in the direction of the major axis of the elliptical orbit while the second pair of eccentric rods 29 extends in the direction of the minor axis ofthe orbit. Thus the displacement of the frame is controlledwith respect to the general directions of both the major and minor axes and the orbit produced by the revolving masses is therefore completely and positively controlled for all conditions of operation. In this embodiment, therefore, elliptical motion might be created by the cooperation of the eccentrics 29 and 29 without the use of the rotating masses 5|, 53 and 54. The importance of using such masses resides in relieving strain on the eccentrics which I prefer to employ merely for the purpose of positively controlling the orbital movement for varying conditions of operation.

The foregoing aresome of the variations that may be made in my means for providing elliptical motion through the use of counter-rotating forces. It will be apparent that a variety of other modifications may be made involving different combinations of the various features disclosed. and such other modifications will suggest themselvesto those skilled in thel art.

Means not involving counter-rotating forces also may be employed to produce the .desired elliptical motion. In the form shown in Figs.

l 7 and 8, for example, only one rotating mass is employed. The screen has a rotating shaft BI extending through its center of gravity. A mass l2 is secured to this shaft and develops a suitable centrifugal force for gyrating the screen. At each side of the screen there is provided a pair of arms B3 connected plvotally to the screen at points 84 arranged in the same horizontal plane with the vcenter of gravity of the screen and spaced equi-distantly from the center of gravity. At their upper ends the arms 83 lare secured to inertia masses 85 suspended from any suitable support by means of springs 68. It will be apparent that as the mass 82 rotates it will impart substantially its full effect to the screen along a line normal to the arms 63, whereas in a directionparallel to these arms the centrifugal force of the mass 62 will be opposed by the inertia ci' the masses 65. No turning moments will be applied to the screen because the mass 62 acts upon the screen directly at its center A of gravity while the inertia masses B5 are'equal and impart their retarding effects along parallel lines and in the same direction at points equally spaced from the center of gravity and on oppo- Site sides thereof.

lt will be clear from the foregoing that the lpath of movement of the screen will be elliptical and that the ratio of the major to the minor axis of the ellipse will depend upon the relation between the "Weight of the live frame and the sum of the masses 85. The larger the masses l5 in proportion to the weight of the frame, the greater will be the ratio between the maior and minor axes of the ellipse. A single mass may be provided in place of the two inertia masses, this single mass being connected by arms to the frame either at its center of gravity or at points e disposed symmetrically with respect thereto. Alternatively, a greater number of inertia masses may be employed so long as care is exercised to balance the turning moments about the center of gravity of the frame. In every case the eccentric engagement of the end of the rod 2! with the central shaft 6| acts to positively control the displacement of Athe frame in the general direction of the major axis of the elliptical motion while exerting little or no effect upon displacement at right angles to this direction. It will be understood that displacement in the direction of the minor axis of the ellipse may be controlled by a second eccentric such as described `in connection with Figs. 5 and 6; that is to say,`

two eccentrics 29 and 29 (or two pair of eccentrics) may be provided in the constructions illustrated in Figs. 1-4 inclusive and Figs. 'l and 8. It will also be apparent that various other combinations of the features disclosed in the several embodiments described may be made. v

I have described in considerable detail a number of diiferent constructions capable of imparting a gyratory movement to a screen or similar body along an elliptical path which is oi' positively controlled or determined extent with respfect to one or both of its axes; yet it will be understood that numerous othermodiiications may be made without departing from the general principles and scope of the invention. Thus, while the rod 29 is, preferably, pivotally anchored to the ground or supporting structure, it may, instead, be of cantilever construction, ilxedly secured to the ground or support and free to flex at its outer vend to the extent required by the eccentric. Moreover, in lieu of the eccentric and strap connection illustrated between the linkv 29 and the revolving shaft, a crank or eccentric pin arrangement may be employed. Thus, the upper end of thelink 29 may simply be engaged over an eccentric pin or crank element rotating with the lshaft I8 (Fig. l) 'I'he terms and expressions employed herein have been used as terms of description and not of limitation. i

I claim: 1

1. A resiliently supported gyrating frame, bearingsmounted on said frame, means jcurnaled in said bearings for transmitting forces therethrough to said frame for imparting a uniform substantially elliptical motion to all portions of said frame, and means associated with said journaled means for positively controlling the displacement of said frame in the general direction of the major axis of said elliptical motion.

2. A resiliently supported gyrating frame, a fixed support in proximity to said frame', bear ings mounted on said frame, means journaled in said bearings for transmitting forces therethrough to said frame for imparting a uniform substantially elliptical motion to all portions of displacement of said frame in the general direction of the major axis of said elliptical motion.

3. In apparatus of .the class described, a gyrating body, means for supportingsaid body for gyratory motion, means for applying a plurality of forces to said body in such direction and of such magnitude as to produce substantially elliptical motion of all portions of said body, and means for positively controlling the displacement of said bodyin the general direction of the major axis of said elliptical motion. c

4. In apparatus of the class described, a gyratory body, a ilxed body in proximity to said gyratory body, means for supporting said gyratory body for gyratory motion, means for applying a plurality of forces tosaid-body in such directions and of such magnitudes as to produce a substantially elliptical motion of all portions of said body, and means secured atone point to said fixed body and at another point to said gyratory body for positively controlling the displacement of said gyratory body in the general girection of the major axis of said elliptical moion. Y

5. In apparatus of the class described, a gyratory body, a fixed support-in proximity to said gyratory body, means for supporting said body for gyratory motion, means. for applying a plurality of forces to said body in such directions and of such magnitudes as .to produce substantially elliptical motion of all portions ofsaid body, and means pivotally secured to said xed support at one point and to said gyratorybody at another point for positively controllingthe displacement of said body in the general direction of the maior axis of said elliptical motion.

6. In apparatus of the. class described, a gyratory body, a iixed support in proximity to said gyratory body, means for supporting said body for gyratory motion, means for applying a plurality of forces to `said body in such direction and of such magnitudes as to produce substantially elliptical motion of all portions of said body, and eccentric means secured atone point to said gyratory body and at another point to said xed support for positively controlling the displacement of said body in the general direction oi the major axis of said elliptical motion.

7. In apparatus of the class described, a gyratory body, a xed support in proximity to said gyratory body,'means for supporting said body for gyratory motion, means for applying a plurality oi forces to said body in such directions and of such magnitudes as to produce substantially elliptical motion of all portions of said body, and means pivoted to said iixed support and connected to said gyratory body for positively controlling the displacement or said body in the general direction of the major axis of said elliptical motion, said last-named means comprising eccentric means associated with said body 8. apparatus of the class described, a gyratory body, a fixedl support in proximity to said gyratory body, means for supporting said body eccentrically mounted oppositely rotating unequal masses mounted on said body, and means secured to said iixed support `and connected to said body for positively controlling the displacement of said body in the general direction of the maior axis of said elliptical motion. said lastnamed means comprising an eccentric cam associated with said eccentrically mounted mass.

13. In apparatus of the class described, a body supported for gyratory motion, means for imparting a uniform substantially elliptical motion to all portions of said body, said means comprising eccentrically mounted oppositely rotating unequal masses mounted on said body, Ithe axis o f rotation of saidmasses being substantially at the center of gravity of said body, and means for positively controlling displacement of said bodyin the general direction of the major' axis of said elliptical motion.

14. In apparatus of the class described, a body supported for vgyratory motion, a iixed support in proximity to said body, means for imparting a uniform substantially elliptical motion to all portions of said body, said means comprising eccentrically mounted oppositely rotating unequal masses mounted on said body, the axis of rotation of said masses being substantially at the center of gravity of said body, and means sefor gyratory motion, means for applying a plurality of forces to said body in such directions and of such magnitudes as to produce substantially elliptical motion of all portions of said body, and means pivoted to said fixed support and connected to said gyratory body for positively controlling the displacement of said body in the general direction of the major axis of said elliptical motion, said last-named means comprising eccentric means associated with said means for imparting elliptical motion.

9. In apparatus of the class described, a body supported for gyratory motion, means for imparting a uniform substantially elliptical motion to all portions of said body, said means comprising eccentrically mounted oppositely rotating unequal masses mounted on said body, and means for positively controlling displacement of said body in the general direction of the major axis of said elliptical motion.

l0. In apparatus of the class described, a body supported for gyratory motion, a xed support in proximity to, said body, means for imparting a uniform substantially elliptical motion to all portions of said body, said means comprising eccentrically mounted oppositely rotating un- 4 equal masses mounted on said body, and means pivoted 'to said iixed support and connected to said body for positively controlling the displacement of said body inthe general direction of the major axis of said elliptical motion.

l2. In apparatusf the class described, a body supported for gyratory motion, a xed support in proximity to said body, means for imparting al uniform substantially elliptical motion to all cured to said fixed support for positively controlling the displacement of said body in the general direction of the major axis of said elliptical motion.

l5. In apparatus of the class described, a gyratory body, means for supporting said body for a free gyratory motion, a fixed support in proximity to said body, and means for imparting a positively controlled elliptical motion to said last-named body, said means comprising a member connecting said body and said fixedsupport 'and including eccentric means.

16. In apparatus of the class described, a gyratory body, means for supporting said body for a free gyratory motion, xed supports arranged in spaced relationship to each other and to said body, and means for imparting a positively controlled elliptical motion to said body, said lastnamed `means comprising a plurality of eccentric cams rotatably mounted with respectI to said body and straps cooperating with each of said eccentric cams, said straps being connected to said spaced supports.

17. In apparatus of the class described, a body supported for gyratory motion, a xed support in proximity to said body, means for imparting a uniform substantially elliptical motion to all portions of said body, said means comprising eccentrically mounted oppositely rotating unequal masses mounted on said body, the axis of rotation of said masses being substantially at the center of gravity of said body, and means secured to said '.iixed ,support forpositively controlling the displacement oi said body in the general direction of the major axis of said elliptical motion, said portions of saidbody, said means comprising tively controlling the displacement of said body in the general direction of the major axis of said elliptical motion.

19. In apparatus of the class described, a resiliently supported body, a iixed support in proximity to said body. means for imparting subtory body, a iixed support, means for resiliently stantially elliptical motion to all portions of said body, said means comprising a plurality of un-v equal masses mounted on said body to revolve in opposite directions, said masses revolving about separate axes eccentric to the centers of gravity of themasses, and means secured to said vxed support and connected to said body for positively controlling the displacement of said frame in the general direction'of the major axis of said elliptical motion.

20. A resiliently supported gyratory frame, bearings mounted on said frame, means journaled in said bearings for transmitting forces therethrough to said frame for imparting a uniform substantially elliptical motion to all portions of said frame, and means for positively controlling the displacement of said frame in the general directions of both the major and the minor axes of said elliptical motion.

21. A resiliently supported gyratory frame, a iixed support in proximity to said frame, bearings mounted on said frame, means journaled in said bearings for transmitting forces therethrough to said frame for imparting a uniform substantially elliptical motion to all portions of said frame, and means secured to said iixed support and connected to said frame for positively controlling the displacement of said frame in the general directions of 'both the major and the` minor axes of said elliptical motion,

22. In apparatus of the class described, a gyratory body, a iixed support, means for supporting said body for gyratory motion, means tending to impart a straight line motion to said body, means for modifying the effect of said lastmentioned-means to produce substantially elliptical mction at all points of said body, and means secured to said iixed support and connected to said body for positively controlling the displacement of said body in the general direction of the major axis of said elliptical motion.

23. In apparatus of the class described, a gyratory body, a iixed support, means for supporting said body for gyratory motion, means tending to impart a straight line motion to said body, means for modifying the effect of said last-mentioned means to produce substantially elliptical motion at all points of said body, and means secured to said fixed support and connected to said body for positively controlling the displacement of said body in the general directions of both the major and the minor axes o1 said elliptical motion.

24. In apparatus of the class described, a gyratory body, a fixed support, means for resiliently supporting said body,'means for applying a constant rotating force to said body, means for applying a second force to said body to modify the effect of said iirst-mentioned force, said two force-applying means being constructed and arranged to -apply a resultant force to said body of constantly changing direction and magnitude, and means secured to said fixed support'and connected to said body for positively controlling the displacement of said body in the general direction of a line lying in a plane which passes through the center of gravity of said body.

25. In apparatus of the class described, a 'gyrasupporting said body, means for applying a plurality of forces to said body, the resultant of said forces being balanced with respect to the center of gravity of said body and being of constantly changing magnitude and direction, and means secured to said fixed support and connected to said body for positively controlling the displacement of said body.

26. In apparatus of the class described, a gyratory body, a xed support, means for resiliently supporting said body, means for applying a plurality of forces to said body, the resultant of said forces being balanced with respect to the center of gravity of said body and being of constantly changing magnitude and direction, and means secured to said iixed support and connected to said body for positively controlling the displacement of said body in the general direction of a line lying in a plane which passes through the center of gravity of said body.

27. In apparatus of the class described, a gyratory body, a xed support, means for resiliently supporting said body, rotating means for applying a force to said body, inertia means connected with said body, said rotating means and said inertia means being so constructed and arranged as to impart to said body the effect of a force constantly changing in direction and magnitude applied at the center of gravity of the body, and means secured to said fixed support and connected to said body for positively controlling the displacement of said body in the general direction of a line lying in a plane passing through the center of gravity of the body.

28. In apparatus of the class described, a gyratory body, a xed support in proximity to said body, means for resiliently supporting said body, separate means for applying a plurality of forces to said body having the resultant effect of a force constantly changing in direction andmagnitude applied at the center of gravity of the body, and means secured to said xed support and connected to said body for positively controlling the displacement of said body in the general direction of a line lying in a plane passing through `the center of gravity of the body.

point to said body and at another point to said fixed support, and eccentric means at one of said points of attachment.

ment in all directions, a link connected with said mass and with said body, a link attached at one pointv to said body and at another point to said iixed support, and eccentric means at one of said points .of attachment, said links being arranged substantially perpendicular to each other.

SAMUEL D. ROBINS. 

